Gold Units-Measures. Gold volume vs. weight conversions.
What is the weight of gold? 
gold volume weight chart:
gold sizex / weightx Pennyweight  Ounces  Troy Ounce   
(dwt) net wt. (oz) (oz tr.)  
cubic centimeter  12.4 dwt 0.68 oz 0.62 oz-t  
(cc, cm3) of gold  
cubic inch  203.2 dwt 11.15 oz 10.16 oz-t  
(cu in, in^3, in³) of gold  
cubic foot  351,089.65 dwt 19,259.77 oz 17,554.48 oz-t  
(cu ft, ft^3, ft³) of gold  
gold sphere (ball)  0.006 dwt 0.0004 oz 0.0003 oz-t  
∅ 1mm  
gold sphere (ball)  6.5 dwt 0.36 oz 0.32 oz-t  
∅ 1cm  
gold sphere (ball)  106.38 dwt 5.836 oz 5.319 oz-t  
∅ 1 inch  
gold wire gauge-18 AWG  10.21 dwt 0.56 oz 0.51 oz-t  
∅ 1.024 mm x 1000 mm long  
gold wire gauge-18 AWG  9.34 dwt 0.512 oz 0.467 oz-t  
∅ 0.0403 in x 1 yd long  
gold wire gauge-24 AWG  2.54 dwt 0.139 oz 0.127 oz-t  
∅ 0.511 mm x 1000 mm long  
gold wire gauge-24 AWG  2.33 dwt 0.128 oz 0.116 oz-t  
∅ 0.0201 in x 1 yd long  
         
What is the weight of gold? 
gold volume weight chart:
gold sizex / weightx Pound  Milligram  Grams  Kilogram 
(lb) (mg) (g) (kg)
cubic centimeter  0.04 lb 19,282 mg 19.282 g 0.02 kg
(cc, cm3) of gold
cubic inch  0.7 lb 316K mg 315.98 g 0.32 kg
(cu in, in^3, in³) of gold
cubic foot  1,204 lb 546,005K mg 546K g 546.01 kg
(cu ft, ft^3, ft³) of gold
gold sphere (ball)  .00002 lb 10.1 mg 0.0101 g .00001 kg
∅ 1mm
gold sphere (ball)  0.022 lb 10,096 mg 10.1 g 0.01 kg
∅ 1cm
gold sphere (ball)  0.36 lb 165,444 mg 165.4 g 0.165 kg
∅ 1 inch
gold wire gauge-18 AWG  0.04 lb 15,879.7 mg 15.88 g 0.016 kg
∅ 1.024 mm x 1000 mm long
gold wire gauge-18 AWG  0.032 lb 14,520.4 mg 14.5 g 0.015 kg
∅ 0.0403 in x 1 yd long
gold wire gauge-24 AWG  0.009 lb 3,954.43 mg 3.954 g 0.004 kg
∅ 0.511 mm x 1000 mm long
gold wire gauge-24 AWG  0.008 lb 3,615.93 mg 3.62 g .0036 kg
∅ 0.0201 in x 1 yd long
U.S. Coin Specifications
Denomination Cent Nickel Dime Quarter Dollar Half Dollar Presidential $1 Native American $1 Coin
Composition Copper Plated Zinc Cupro-Nickel Cupro-Nickel Cupro-Nickel Cupro-Nickel Manganese-Brass Manganese-Brass
2.5% Cu 25% Ni 8.33% Ni 8.33% Ni 8.33% Ni 88.5% Cu 88.5% Cu
Balance Zn Balance Cu Balance Cu Balance Cu Balance Cu 6% Zn 6% Zn
          3.5% Mn 3.5% Mn
          2% Ni 2% Ni
Weight 2.500 g 5.000 g 2.268 g 5.670 g 11.340 g 8.1 g 8.1 g
Diameter 0.750 in. 0.835 in. 0.705 in. 0.955 in. 1.205 in. 1.043 in. 1.043 in.
19.05 mm 21.21 mm 17.91 mm 24.26 mm 30.61 mm 26.49 mm 26.49 mm
Thickness 1.55 mm 1.95 mm 1.35 mm 1.75 mm 2.15 mm 2.00mm 2.00 mm
Edge Plain Plain Reeded Reeded Reeded Edge-Lettering Edge-Lettering
No. of Reeds N/A N/A 118 119 150 N/A N/A
1 cu. Ft. of gold weighs 1206.1082 pounds or 1465.757 Troy pounds
1 liter of gold weighs 19.32 kilograms
1 cubic foot = 28.3168467 liter 1 ton = 2865.415 cu in 
1 kilogram = 2.2046226 pound 1 ton = 1.658226 cu ft
1 pound [troy] = 0.8228571 pound 1 metric ton = 1.827881 cu ft
1 pound = 1.2152778 pound [troy] 1 metric ton = 3158.579 cu in
1728 cu. In. in a cu. Ft. 1 metric ton = 51759.83 cu cm
1 cu. In.= 0.6979793 pounds 1 ton [short] = 0.9071847 ton [metric]  
or 11.167668 ounces 1 ton [metric] = 1.1023113 ton [short]  
or 0.8482387 Troy pounds 1 ton [metric] = 2,204.6226218 pounds  
or 10.178865 Troy ounces 1 cubic centimeter = 0.0610237 cubic inch  
1 cubic inch = 16.3870641 cubic centimeters  
1 ounce = 0.9114583 ounce [troy] 1 cubic foot = 28,316.8467117 cubic centimeters
1 ounce [troy] = 1.0971429 ounce 1 ounce of gold = 16 square meters of gold leaf  
one fine troy ounce is equal to 31.1035 grams
USGS states 193,000 metric tons of gold exists in the world (most current estimate)
193,000 m tons = 352781.1 cu ft
193,000 m tons = a cube 70ft 8 in on a side